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  • 1
    ISSN: 0942-0940
    Keywords: Spinal cord injury ; spinal cord blood flow ; arterial diameter ; CO2 reactivity ; autoregulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Simultaneous measurements of spinal cord blood flow and arterial diameter at areas adjacent to a site of spinal cord injury were carried out to determine changes in CO2 reactivity and autoregulation. The spinal cord injury was made at T10 level by the epidural clip compression method. A spinal window was drilled at an area either 7 mm caudal or 7 mm rostral to the injury site for the measurement of spinal cord blood flow and arterial diameter at the same time. Spinal cord blood flow was decreased at both spinal windows, especially at the rostral window. Arterial diameter was also decreased significantly at both sites. The ischaemic zone evaluated histologically tended to expand more diffusely in the rostral direction than in the caudal direction. In the pre-injury stage, both CO2 reactivity and autoregulation were present in the spinal cord. Following the clip injury, CO2 reactivity and autoregulation were both impaired in the areas 7 mm adjacent to the impact site. Correlation coefficients suggested that the rostral spinal cord tended to sustain more injury than the caudal spinal cord. The histologically proven spinal cord ischaemia following the injury may have resulted from the decreased arterial diameter and impaired CO2 reactivity and dysautoregulation of the spinal cord.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 50 (1993), S. 57-66 
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The tensile strain rate effect in tensile strength and elongation at break for a series of filled dummy hydroxy-terminated polybutadiene (HTPB) propellant binders was studied. The data were obtained at various tensile strain rates from 10-4 to 10-1 s-1 on two types of specimens at room temperature. The “high velocity ductility” behaviour, which is qualitatively similar to those of unfilled elastomers, was revealed. This means that the breaking strain increases markedly at elevated strain rates. For “Bukkon-type” and rod-shaped specimens, test results are consistent with each other. The fact that the increased filled solids level leads to a decreased breaking elongation capability and an increased tensile strength was obviously found. © 1993 John Wiley & Sons, Inc.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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